Signing Mbeumo for 75 Million Euros is ridiculous, but it's more ridiculous to see Manchester United are interested to sign Jackson, Chelsea have set a price Jackson price for 70 Million Euros, which is high, player like him only worth around 40 Million Euros.
The market for forwards is horrible tbh. I think Sesko or Ekitike is priced so high too. Unless the player has a buy-out clause or something, the clubs will likely try to push the price as high as possible. Even Diaz is rumoured to be around 80 million or something, last time I checked the rumours. If you put that into context, one could argue that the price for Jackson or Mbuemo is not that crazy, although it's still overpriced for most of them.